Multi body dynamics of a slipper in swash plate type piston pumps and motors coupled with hydrodynamic analysis of oil-film

Abstract

In swash plate type piston pumps and motors, the slippers are used under heavy load. So the slippers are designed as a hydrostatic bearing to ensure reliability. However slippers behavior during operation is very complex, we must take into consideration rapid changes in the hydraulic, centrifugal force and oil-film lubrication of sliding parts. In this study, a test for slippers was conducted under quasi-static state and analysis to simulate it was performed. By considering the elastic deformation of a slipper due to hydraulic pressure in the analysis, analysis results of center displacements of the slipper are in good agreement with the experimental results. In the analysis, multi body dynamics model was coupled with hydrodynamic analysis of oil-film, which makes it relatively easy to take into account effect of other mechanical components and dynamic changes. This technique can also be applied to the analysis that takes into account the other components of the pump motor.

Keywords

• axial piston motor
• slippers
• hydraulics
• hydrostatic bearing
• simulation